An object of the present invention is to provide a technique that can stably improve the introduction efficiency of foreign substances, and more particularly, a technique for performing in vivo electroporation with quick and easy operations without being affected by the skill of the operator. The present invention provides an electrode for electroporation including a plurality of electrode needles, wherein first polarity electrode needles, an electrode needle holding portion, and a syringe holding portion are provided； two or more first polarity electrode needles project from a bottom surface of a lower structural body of an outer frame support of the electrode needle holding portion toward an electroporation target side； the bottom surface of the lower structural body of the outer frame support is provided with a hole for syringe needle insertion and removal communicating with a syringe holding portion side； the syringe holding portion is provided on a side opposite to the electroporation target side of the electrode needle holding portion； and the syringe holding portion has a path for syringe needle insertion and removal, at least a portion of the path for syringe needle insertion and removal being provided with an electro-conductive portion for a second polarity.
